Flow and pressure describe different things
Flow is the amount of oil supplied over time; pressure describes the hydraulic loading. Matching one value does not establish that the complete attachment system is suitable. Use the requirements of the selected model.
Identify the required circuits
A breaker, rotating grapple and shear can require different connections and control functions. Include the available auxiliary circuits, return arrangement and any case-drain information specified by the attachment manufacturer.
Compare like-for-like specifications
Keep operating ranges, maximum limits and test conditions separate. Include the excavator make and model plus the attachment’s mounting arrangement. The final installation must follow the equipment specifications.
Key Points to Compare
| Item | What it describes | What to check |
|---|---|---|
| Flow | Usually expressed in L/min | Available flow at the attachment |
| Pressure | Usually expressed in bar or MPa | Required operating range and limits |
| Circuit | Supply, return and additional functions | Connections and controls |
Information to Send
- Excavator make, model and weight
- Available auxiliary flow and pressure
- Return line, controls and mounting
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